docs: def deletion_rate(Nref, Ndeletions, eps=numpy.spacing(1)):
      """Deletion rate
  
      Parameters
      ----------
      Nref : int >=0
          Number of entries in the reference.
  
      Ndeletions : int >=0
          Number of deletions.
  
      eps : float
          eps.
          Default value numpy.spacing(1)
  
      Returns
      -------
      deletion_rate: float
          Deletion rate
          
      """
  
      return float(Ndeletions / (Nref + eps))